:root {
  color-scheme: dark;
  --ink: #f2f5ef;
  --muted: #9ba79f;
  --night: #0b100e;
  --panel: #131b17;
  --panel-2: #18231e;
  --line: #2c3932;
  --lime: #c9f45b;
  --mint: #70d8aa;
  --danger: #ff6a5f;
  --amber: #f6c85f;
  --cell-size: 36px;
  --display: "Arial Black", "Helvetica Neue", Arial, sans-serif;
  --body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 280px;
  background: var(--night);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    radial-gradient(circle at 82% 4%, rgba(201, 244, 91, 0.09), transparent 32rem),
    var(--night);
  background-size: 32px 32px, 32px 32px, auto, auto;
  font-family: var(--body);
  line-height: 1.5;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

.game-header,
main,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.game-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 80px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 850;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--night);
  background: var(--lime);
  border-radius: 9px;
  font-family: var(--display);
}

.game-header > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.game-header > p span {
  color: var(--lime);
}

.game-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 420px);
  gap: 60px;
  align-items: end;
  padding: 72px 0 46px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--lime);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-family: var(--display);
  font-size: clamp(3.2rem, 8vw, 7rem);
  line-height: 0.88;
  letter-spacing: -0.07em;
}

.game-intro > p {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 1.02rem;
}

.game-shell {
  padding-bottom: 86px;
}

.difficulty-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px 12px 0 0;
}

.difficulty-picker button {
  display: grid;
  gap: 2px;
  min-height: 72px;
  padding: 14px 18px;
  text-align: left;
  background: var(--panel);
  border: 0;
  cursor: pointer;
}

.difficulty-picker button:hover,
.difficulty-picker button:focus-visible {
  background: #1a2620;
}

.difficulty-picker button[aria-pressed="true"] {
  color: var(--night);
  background: var(--lime);
}

.difficulty-picker strong {
  font-size: 0.9rem;
}

.difficulty-picker span {
  color: var(--muted);
  font-size: 0.72rem;
}

.difficulty-picker button[aria-pressed="true"] span {
  color: #344018;
}

.console {
  padding: clamp(18px, 4vw, 42px);
  background: rgba(19, 27, 23, 0.96);
  border: 1px solid var(--line);
  border-top: 0;
  border-radius: 0 0 16px 16px;
}

.scoreboard {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  max-width: 760px;
  margin: 0 auto 18px;
}

.stat {
  display: grid;
  gap: 1px;
}

.stat--right {
  text-align: right;
}

.stat span {
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.stat strong {
  color: var(--lime);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(1.7rem, 4vw, 2.6rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.new-game {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 17px;
  color: var(--ink);
  background: transparent;
  border: 1px solid #536158;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
}

.new-game:hover,
.new-game:focus-visible {
  color: var(--night);
  background: var(--mint);
  border-color: var(--mint);
}

.new-game span {
  font-size: 1.15rem;
}

.game-meta {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  max-width: 760px;
  margin: 0 auto 22px;
  padding-top: 14px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
}

.game-meta p {
  margin: 0;
}

.game-meta strong {
  color: var(--ink);
}

.mode-controls {
  display: none;
  max-width: 760px;
  margin: 0 auto 18px;
  padding: 12px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: #0e1512;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.mode-controls > span {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.mode-controls > div {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.mode-controls button {
  min-width: 94px;
  min-height: 42px;
  padding: 0 15px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 7px;
  font-weight: 800;
  cursor: pointer;
}

.mode-controls button[aria-pressed="true"] {
  color: var(--night);
  background: var(--lime);
  border-color: var(--lime);
}

.board-scroller {
  max-width: 100%;
  overflow: auto;
  padding: 10px;
  background: #080c0a;
  border: 1px solid #303c36;
  border-radius: 12px;
  scrollbar-color: var(--mint) #101713;
}

.board-scroller:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}

.board {
  display: grid;
  grid-template-columns: repeat(var(--columns), var(--cell-size));
  gap: 2px;
  width: max-content;
  margin: auto;
  touch-action: manipulation;
  user-select: none;
}

.board[data-difficulty="intermediate"] {
  --cell-size: 30px;
}

.board[data-difficulty="expert"] {
  --cell-size: 27px;
}

.cell {
  display: grid;
  width: var(--cell-size);
  height: var(--cell-size);
  padding: 0;
  place-items: center;
  color: var(--ink);
  background: #29362f;
  border: 1px solid #3b4b42;
  border-radius: 3px;
  box-shadow: inset 1px 1px 0 rgba(255, 255, 255, 0.08), inset -1px -1px 0 rgba(0, 0, 0, 0.25);
  font-family: var(--display);
  font-size: calc(var(--cell-size) * 0.47);
  line-height: 1;
  cursor: pointer;
}

.cell:hover:not(.cell--revealed),
.cell:focus-visible:not(.cell--revealed) {
  background: #34463c;
  border-color: var(--mint);
  outline: none;
}

.cell--revealed {
  background: #121a16;
  border-color: #1d2822;
  box-shadow: none;
  cursor: default;
}

.cell--flagged {
  color: var(--night);
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: none;
}

.cell--mine {
  color: var(--danger);
  background: #281917;
  border-color: #4c2925;
}

.cell--exploded {
  color: #190503;
  background: var(--danger);
  border-color: var(--danger);
}

.cell--wrong {
  color: var(--danger);
  background: #201713;
  border-color: var(--danger);
}

.cell--n1 { color: #77b7ff; }
.cell--n2 { color: #70d8aa; }
.cell--n3 { color: #ff887f; }
.cell--n4 { color: #b7a1ff; }
.cell--n5 { color: #f7a96e; }
.cell--n6 { color: #6fdddc; }
.cell--n7 { color: #d6d9d7; }
.cell--n8 { color: #8e9a93; }

.how-to {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(50px, 9vw, 120px);
  padding: 86px 0 100px;
  border-top: 1px solid var(--line);
}

.how-to h2 {
  margin-bottom: 0;
  font-family: var(--display);
  font-size: clamp(2rem, 4.4vw, 4rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.how-to ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.how-to li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.how-to li:first-child {
  padding-top: 0;
}

.how-to li > span {
  color: var(--lime);
  font-family: var(--display);
  font-size: 0.72rem;
}

.how-to li p {
  margin: 0;
  color: var(--muted);
}

.how-to li strong {
  color: var(--ink);
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 28px 0 40px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
}

footer a {
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

footer a:hover,
footer a:focus-visible {
  color: var(--lime);
}

footer p {
  margin: 0;
}

@media (hover: none), (pointer: coarse), (max-width: 720px) {
  .mode-controls {
    display: flex;
  }
}

@media (max-width: 780px) {
  .game-header,
  main,
  footer {
    width: min(100% - 24px, 680px);
  }

  .game-intro {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 54px;
  }

  .difficulty-picker button {
    min-height: 68px;
    padding: 12px;
  }

  .how-to {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 540px) {
  .game-header {
    min-height: 68px;
  }

  .game-header > p {
    font-size: 0.62rem;
  }

  .game-intro {
    padding: 48px 0 34px;
  }

  h1 {
    font-size: clamp(3rem, 17vw, 5.2rem);
  }

  .difficulty-picker {
    grid-template-columns: 1fr;
  }

  .difficulty-picker button {
    grid-template-columns: 1fr auto;
    align-items: center;
    min-height: 52px;
  }

  .console {
    padding: 16px 10px 18px;
  }

  .scoreboard {
    grid-template-columns: 1fr 116px 1fr;
    gap: 8px;
  }

  .new-game {
    min-height: 42px;
    padding: 0 10px;
    font-size: 0.67rem;
  }

  .game-meta {
    align-items: start;
    font-size: 0.7rem;
  }

  .game-meta p:first-child {
    max-width: 66%;
  }

  .mode-controls {
    align-items: stretch;
    flex-direction: column;
  }

  .mode-controls > div {
    width: 100%;
  }

  .mode-controls button {
    min-height: 48px;
  }

  .board-scroller {
    padding: 7px;
  }

  .board[data-difficulty="beginner"] {
    --cell-size: 32px;
  }

  .board[data-difficulty="intermediate"] {
    --cell-size: 25px;
  }

  .board[data-difficulty="expert"] {
    --cell-size: 24px;
  }

  .how-to {
    padding: 72px 0 82px;
  }

  footer {
    display: block;
  }

  footer p {
    margin-top: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}